358 citations · 2k across the 30 of their papers we have counts for
6 papers · 1 filter
Large power spectrum and primordial black holes in the effective theory of inflation
Guillermo Ballesteros, Sebastián Céspedes, Luca Santoni
We study the generation of a large power spectrum, necessary for primordial black hole formation, within the effective theory of single-field inflation. The mechanisms we consider…
Thermodynamics of perfect fluids from scalar field theory
Guillermo Ballesteros, Denis Comelli, Luigi Pilo
The low-energy dynamics of relativistic continuous media is given by a shift-symmetric effective theory of four scalar fields. These scalars describe the embedding in spacetime of…
Massive and modified gravity as self-gravitating media
Guillermo Ballesteros, Denis Comelli, Luigi Pilo
We study the effective field theory that describes the low-energy physics of self-gravitating media. The field content consists of four derivatively coupled scalar fields that can…
The effective theory of fluids at NLO and implications for dark energy
Guillermo Ballesteros
We present the effective theory of fluids at next-to-leading order in derivatives, including an operator that has not been considered until now. The power-counting scheme and its c…
The effective field theory of multi-component fluids
Guillermo Ballesteros, Brando Bellazzini, Lorenzo Mercolli
We study the effective Lagrangian, at leading order in derivatives, that describes the propagation of density and metric fluctuations in a fluid composed by an arbitrary number of…
Effective perfect fluids in cosmology
Guillermo Ballesteros, Brando Bellazzini
We describe the cosmological dynamics of perfect fluids within the framework of effective field theories. The effective action is a derivative expansion whose terms are selected by…